<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box {
            width: 400px;
            height: 400px;
            margin: 100px auto;
            transition: 2s;
        }

        .box div {
            width: 180px;
            height: 180px;
            margin: 8px;
            border: 1px solid #000;
            float: left;
            background: url(./images/new_bg.png) no-repeat;
        }

        .box div:nth-of-type(1) {
            border-radius: 10px 150px;
        }

        .box div:nth-of-type(2) {
            border-radius: 150px 10px;
        }

        .box div:nth-of-type(3) {
            border-radius: 150px 10px;
        }

        .box div:nth-of-type(4) {
            border-radius: 10px 150px;
        }

        .box:hover {
            transform: rotate(360deg);
        }
    </style>
</head>

<body>
    <div class="box">
        <div></div>
        <div></div>
        <div></div>
        <div></div>
    </div>
</body>

</html>